On-Vehicle Inspection: Notes

WARNING: This page is about a different car, the 2004 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT REFRIGERANT VOLUME
1. Observe the sight glass on the cooler refrigerant liquid pipe A.
  Test conditions:
  - Engine is running at 1,500 RPM
  - Blower speed control switch is at "HI"
  - A/C switch is ON
  - Temperature control dial is at "MAX. COOL"
  - Doors are fully open.
Fig 1: Identifying Slight Glass
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Inspection Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
1. This is a method in which the trouble is located by using a manifold gauge set. Read the manifold gauge pressure when these conditions are established.
  Test conditions:
  - Temperature at the air inlet with the switch set at RECIRC is 30 - 35 °C (86 - 95 °F)
  - Engine is running at 1,500 RPM
  - Blower speed control switch is at "HI"
  - Temperature control dial is at "COOL"
  - A/C switch is ON
  - Doors are fully open.
  1. Normally functioning refrigeration system.
    Gauge reading:
    1. Low pressure side: 0.15 - 0.25 MPa (1.5 - 2.5 kgf/cm ²
    2. High pressure side: 1.37 - 1.57 MPa (14 - 16 kgf/cm ² )
    Fig 3: Identifying Gauge Reading For Normally Functioning Refrigeration System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Moisture present in refrigeration system.
    
    Fig 4: Identifying Gauge Reading For Moisture Present In Refrigeration System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 5: Symptom Cause Table - Moisture Present In Refrigeration System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Insufficient cooling
    
    Fig 6: Identifying Gauge Reading For Insufficient cooling
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 7: Symptom Cause Table - Insufficient cooling
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Poor circulation of refrigerant
    
    Fig 8: Identifying Gauge Reading For Poor Circulation Of Refrigerant
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 9: Symptom Cause Table - Poor Circulation Of Refrigerant
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Refrigerant does not circulate
    
    Fig 10: Identifying Gauge Reading For Refrigerant Does Not Circulate
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 11: Symptom Cause Table - Refrigerant Does Not Circulate
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Refrigerant is overcharged or cooling of effectiveness of condenser is insufficient
    
    Fig 12: Identifying Gauge Reading For Refrigerant Is Overcharged Or Cooling Of Effectiveness Of Condenser Is Insufficient
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 13: Symptom Cause Table - Refrigerant Is Overcharged Or Cooling Of Effectiveness Of Condenser Is Insufficient
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Air present in refrigeration system
    
    Fig 14: Identifying Gauge Reading For Air Present In Refrigeration System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 15: Symptom Cause Table - Air Present In Refrigeration System
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Expansion valve improper
    
    Fig 16: Identifying Gauge Reading For Expansion Valve Improper
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 17: Symptom Cause Table - Expansion Valve Improper
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. Defective compression compressor
Fig 18: Identifying Gauge Reading For Defective Compression Compressor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 19: Symptom Cause Table - Defective Compression Compressor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002